@Alexandra707 - It looks like your team space has been updated to the new dashboard/view called Spaces - you can read more about Spaces here: https://help.miro.com/hc/en-us/articles/21040490154898-Spaces

Is there something specific you are needing help with?

Yes,
I would like to come back to the previous one look. How to do that?

@Alexandra707 - This does not appear to be possible. This is the new experience rolling out to all users.

It’s very uncomfortable to use. Specially for teaching. Letters are small, all boards are together in one side. Hard to navigate between them.
Some of board are appearing in previous stile, another in new, uncomfortable one. If you can send this to designers, I would appreciate it very much. This is my bad user experience.
Thank you in advice.